Kelly valve
The Kelly cock valve, which is a manually operated ball valve run in the I.D.of drill string, is one of effective tool for preventation from blowout. The kelly cock is divided into upper kelly coc...

Upper and Lower Kelly Valve
Kelly Valve also named Kelly Cock/Drill Pipe Safety Valve allowing free passage of drilling fluid without pressure loss. The valve can be used as a dill pipe safety valve or upper kelly valve to c...

Kelly Cock Valve
The Kelly cock valve, which is a manually operated ball valve run in the I.D.of drill string, is one of effective tool for preventation from blowout. The kelly cock is divided into upper kelly coc...

Kelly Cock Valve
Kelly Cock Valve The Kelly cock valve is a manually operated ball valve run in the I.D of drill string, it is one of effective tool for preventation from blowout. The Kelly cock valve is divided ...